Attachment for vertically mounted file holder



FIG. 1 is a reduced perspective view of an attachment for vertically mounted file holder embodying my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a side view thereof;

FIG. 6 is a bottom view thereof. 

The ornamental design for a attachment for vertically mounted file holder, substantially as shown. 